package yangsw87.basic;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
// ctrl + shift + O

//import java.sql.*; // 편하긴 편한데 가독성 측면에서는 좋지 않다.
				   // 내가 어떤 것을 사용하는지 모르기 때문

public class J20_BookDBDAO implements J20_BookDBService{
	
	// JDBC 접속 정보
	private static final String DRV = "oracle.jdbc.OracleDriver";
	private static final String URL = "jdbc:oracle:thin:@//localhost:1521/xe";
	private static final String USR = "scott";
	private static final String PWD = "TIGER";

	// SQL문 작성
	private static final String insertSQL = " insert into BookDB values(BookDB_id.nextval,?,?,?,sysdate) ";
	private static final String selectSQL = " select * from BookDB order by id desc ";
	private static final String selectSQLbyID = " select * from BookDB where id=? order by id desc ";
	private static final String updateSQL = " update BookDB set title=?, publisher=?, author=?, regdate=sysdate where id=?";
	private static final String deleteSQL = " delete from BookDB where id=? ";
	
	@Override
	public int insertBookDB(J20_BookDBVO bvo) {
		Connection conn = null;
		PreparedStatement ps = null;
		int cnt=0;
		
		try{
			Class.forName(DRV);
			conn=DriverManager.getConnection(URL, USR, PWD);
			ps=conn.prepareStatement(insertSQL);
				ps.setString(1, bvo.getTitle());
				ps.setString(2, bvo.getPublisher());
				ps.setString(3, bvo.getAuthor());

			cnt = ps.executeUpdate();
			
		} catch (Exception ex){
			ex.printStackTrace();
		} finally {
			if(ps!=null)
				try{
					ps.close();
				} catch (Exception ex){
				}
			if(conn!=null)
				try{
					conn.close();
				} catch (Exception ex){
				}
		}
		return cnt;
	}

	@Override
	public String selectBookDB() {
		Connection conn=null;
		PreparedStatement ps =null;
		ResultSet rs = null; // 조회에서 추가됨
		String result=""; // Arraylist로 변경예정
		
		try{
			Class.forName(DRV);
			conn=DriverManager.getConnection(URL, USR, PWD);
			ps=conn.prepareStatement(selectSQL);
			rs=ps.executeQuery();
			
			// select문 실행 후 결과 처리			
			while(rs.next()){
				for(int i=1;i<=5;++i)
					result+=rs.getString(i) + " ";
				result += "\n";
			}
			
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if(rs!=null)
				try{
					rs.close();
				} catch (Exception ex){
				}
			if(ps!=null)
				try{
					ps.close();
				} catch (Exception ex){
				}
			if(conn!=null)
				try{
					conn.close();
				} catch (Exception ex){
				}
		}
		return result;
	}

	@Override
	public String selectBookDBbyID(String id) {
		
		Connection conn=null;
		PreparedStatement ps =null;
		ResultSet rs = null; // 조회에서 추가됨
		String result=""; // ArrayList로 변경예정
		
		try{
			Class.forName(DRV);
			conn=DriverManager.getConnection(URL, USR, PWD);
			ps=conn.prepareStatement(selectSQLbyID);
			ps.setString(1, id);
					
			rs=ps.executeQuery();
			
			while(rs.next()){
				for(int i=1;i<=5;++i)
					result+=rs.getString(i) + " ";
				result += "\n";
			}
			
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if(rs!=null)
				try{
					rs.close();
				} catch (Exception ex){
				}
			if(ps!=null)
				try{
					ps.close();
				} catch (Exception ex){
				}
			if(conn!=null)
				try{
					conn.close();
				} catch (Exception ex){
				}
		}
		return result;
	}
	
	@Override
	public int updateBookDB(J20_BookDBVO bvo) {
		Connection conn =null;
		PreparedStatement ps = null;
		int cnt=0;
		
		try{
			Class.forName(DRV);
			conn = DriverManager.getConnection(URL, USR, PWD);
			ps = conn.prepareStatement(updateSQL);
			
			ps.setString(1, bvo.getTitle());
			ps.setString(2, bvo.getPublisher());
			ps.setString(3, bvo.getAuthor());
			ps.setString(4, bvo.getId());
			
			cnt=ps.executeUpdate();
						
		} catch (Exception ex){
			ex.printStackTrace();
		} finally {
			if(ps!=null)
				try{
					ps.close();
				} catch (Exception ex){
				}
			if(conn!=null)
				try{
					conn.close();
				} catch (Exception ex){
				}
		}
		return cnt;
	}

	@Override
	public int deleteBookDB(String id) {
		Connection conn = null;
		PreparedStatement ps = null;
		int cnt =0;
		
		try{
			Class.forName(DRV);
			conn = DriverManager.getConnection(URL, USR, PWD);
			ps = conn.prepareStatement(deleteSQL);
				ps.setString(1, id);
			
			cnt=ps.executeUpdate();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if(ps!=null)
				try{
					ps.close();
				} catch (Exception ex) {
				}
			if(conn!=null)
				try{
					conn.close();
				} catch (Exception ex) {
				}
		}		
		return cnt;
	}
	
}
